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Total alkyl dibenzothiophenes content tracing the filling pathway of condensate reservoir in the Fushan Depression,South china Sea

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Science china earth {2. 2008年第S2期51卷 138-145页

作者： li meijun1,wang tieguan1,{2.,ma qinlin2.& gao lihui2.1 state key laboratory of petroleum resources and {12.,earth sciences and geoinformatics school,china university of petroleum,beijing 102.49,china 2.Southern Oil Exploration and Development Company,Petrochina,Guangzhou 510640,china 3 Guangzhou Institute of Geochemistry,Chinese Academy of sciences,Guangzhou 5102.0,china china Univ Petr Earth Sci & Geoinformat Sch State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China Petrochina So Oil Explorat & Dev Co Guangzhou 510640 Peoples R China Chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510240 Guangdong Peoples R China

The condensates are generally characterized by high maturity,low concentration of steranes and ter-panes biomarkers and low content of non-hydrocarbon fraction. In this case commonly used steranes,terpanes and carbazoles parameters cannot be effectively app{2.ed in the reservoir-fil{2.ng tracing. The hydrogen bond formed by sulfur atom in the dibenzothiophenes (DBTs) results in molecule adsorption and fractionation during oil migration in reservoir. {2.ke carbazoles,total DBTs content decreases with the increasing of oil migration distance. Therefore,a new parameter——total DBTs content is proposed to be used to trace the oil migration orientation and fil{2.ng pathway. In present study,total DBTs con-tents of condensates and {2.ght oils are obtained by adding internal standard——eight deuterium atoms substituted DBT during Gas Chromatography-mass Spectrometry analysis of aromatic fraction. Except for a few samples with much lower content of non-hydrocarbon fraction,the total DBTs content shows a fine positive correlation with that of carbazoles. Large errors can be caused in the process of pyrro{2.c nitrogen compounds separation. The app{2.cation of this new parameter in the Fushan Depression of Beibu Gulf Basin,South {12. Sea indicates that this parameter is a re{2.able one to trace fil{2.ng pathway in condensate reservoirs. Combined with other DBTs-related parameters,such as 4-/1-methydibenzo-thiophene and 2.4-/1,4-dimethyldibenzothiophene,oil migration orientation and fil{2.ng pathway of the Fushan Depression was determined. The accumulations of Huachang oil field in the Fushan Depres-sion are mainly migrated and charged from northeast to southeast along the Huachang up{2.ft. It can be predicated that the {2.ght oil and condensates in the Huachang oil field should be sourced from the source kitchen at the Bai{2.an Sag. It shows that total DBTs content is an effective parameter to tracing oil migration orientation and fil{2.ng pathway.

关键词： dibenzothiophene alkyl dibenzothiophene condensate reservoir filling pathway molecular markers the Fushan Depression

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Alkyl Naphthalenes and Phenanthrenes:Molecular markers for Tracing Filling Pathways of light Oil and Condensate Reservoirs

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Acta Geologica Sinica(English Edition) 2010年第5期84卷 1294-1305页

作者： li meijun {2. tieguan liu ju zhang meizhu lu hong ma Qinglin {12. lihui state key {2. of petroleum resources and prospecting College of Geosciences China University of Petroleum Beijing 102249 China Southern Oil Exploration and Development Company PetroChina Guangzhou Guangdong 51064 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong 510240 China

Condensates and light oils are generally characterized by high maturity, low concentration of sterane and terpane biomarkers and low content of non-hydrocarbon fraction. As a result, some commonly-used sterane, terpane and carbazole migration parameters in conventional oil reservoirs may have a certain limitation in condensate and light oil reservoirs for their poor signal-noise ratios in the gas chromatography-mass spectrometry （GC-MS）. Naphthalene, phenanthrene and their methylated substituents, however, are present in significant concentrations in condensates and light oils. Taking the Fushan depression （in the Beibuwan Basin, Northern South china Sea） as an example, this paper attempts for the first time to use polycyclic aromatic hydrocarbon （PAH）-related parameters to trace migration directions and filling pathways for condensate and light oil reservoirs. The result shows that TMNr （i.e. 1, 3, 7-TMN/（1, 3, 7-TMN ＋ 1, 2. 5-TMN）, TMN： trimethylnaphthalene））, MPI-1 （i.e. 1.5×（2.MP ＋ 3-MP）/（P ＋ 1-MP ＋ 9-MP）, P： phenanthrene MP： methyiphenanthrene）, MN/DMN （∑methylnaphthalene/∑dimethylnaphthalene, %） and MN/TMN （∑nethylnaphthalene/∑trimethylna- phthalene, %） can be used to trace the filling pathways of condensate and light oil reservoirs. These parameters, together with geological consideration and other bulk oil properties （e.g. the gas to oil ratio and density）, suggest that the condensates and light oils in the Huachang oil and gas field are mainly sourced from the Bailian sag that is located to the northeast of the Huachang uplift in the Fushan depression.

关键词： condensate light oil polycyclic aromatic hydrocarbon (PAH) naphthalene phenanthrene,migration filling pathway Fushan depression

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The Occurrence of Oleananes in the Beibuwan Basin and Its Application to the Study of maturity and Oil-Source Rock Correlation

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Acta Geologica Sinica(English Edition) 2008年第3期82卷 585-595页

作者： li meijun {2. tieguan liu ju zhang meizhu lu hong ma Qinglin {12. lihui state key {2. of petroleum Resource and prospecting Earth Sciences and Geoinformatics School China University of Petroleum Beijing 102249 China Southern Oil Exploration and Development Company PetroChina Guangzhou 510640 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510240 China

The oleanane parameter, i.e., OP （oleananes/（oleananes＋C30hopanes）） in the two sedimentary columns of the Beibuwan Basin, South china Sea, can be used to de{2.mit the top of oil generation window, with Ro （/%） of 0.53 in Well M1 and 0.55 in Wells H1/Hd1/Hd2. respectively. Comparing with vitrinite reflectance （Ro/%）, the OP features a dynamic range and can indicate the oil generation window more precisely. By using OP and other geochemical indices, the oil-source correlation is also conducted. It suggests that the oils in wells M1 and M2.are derived from the source rocks in situ. The mudstone in Huachang up{2.ft is not the main source rocks for oils in this area, The OP is also a useful oil-source correlation parameter in some Tertiary lacustrine basins.

关键词： oleanane parameter (OP) biomarker maturity oil-source correlation Fushan Depression

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Characteristics of Oil and Gas Accumulation in Yong'an-Meitai Area of the Fushan Depression,Beibuwan Basin,South china Sea

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petroleum Science 2007年第4期4卷 23-33页

作者： li meijun {2. tieguan liu ju zhang meizhu lu hong ma Qinglin {12. lihui key laboratory for Hydrocarbon Accumulation Mechanism Ministry of Education School of Resources and lnformation China University of Petroleum Beo＇ing 102249 China South Oil Exploration and Development Company PetroChina Guangzhou Guangdong 510240 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong 510640 China

The Yong＇an-Meitai area is the focus of the present exploration in the Fushan Depression, Beibuwan Basin, South china Sea. All oils from this area are geochemically characterized by higher Pr/Ph ratio, higher proportion of heavy molecular weight hydrocarbons, and higher proportion of C2. regular steranes, which indicate that the organic matter of source rocks might have been deposited in an oxidizing palaeoenvironment and be dominated by higher plant organic matter input. The oil from E3w2.（the second member of Weizhou Fro. of the Oligocene） has a much higher density, relatively higher Pr/nC17 and Ph/nC18 ratios, and a ＂UCM--unresolved complex mixture＂ on gas chromatograms, which indicate that it has been slightly biodegraded. CPI and other terpane and sterane isomer ratios suggest they are all mature oils. The timing of oil charging in E3w2.and E2.1 （the first member of the liushagang Fro. of the Eocene） determined by the homogenization temperatures of fluid inclusions and thermal evolution history are from 9-3 ma and 8-3 ma, respectively. Thus, the interpretation of E3w2.as a secondary reservoir is unlikely. The timing of oil charging is later than that of hydrocarbon generating and expulsion of liushagang Fin. source rocks and trap formation, which is favorable for oil accumulation in this area. All molecular parameters that are used for tracing oil filling direction decrease with shallower burial depth, which suggests vertical oil migration. The widely occurring faults that penetrate through the source rocks of the liushagang Fro. may serve as a fine oil charging conduit.

关键词： Reservoir geochemistry homogenization temperature burial and thermal history oil migration and accumulation the Fushan Depression

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